英文關鍵字
aluminum
angle
background
bar
bars
blue
building
bundle
button
carrying
checking
circles
close
construction
couple
couplers
crane
cutter
cutting
duct
engineer
engineering
equipment
factory
focus
front
gloves
going
grey
grinding
industrial
industry
iron
labor
left
light
locking
machine
making
manufacturing
metal
moving
pan
pipe
pipes
pressing
product
pull
reinforcement
right
rod
rusty
safety
side
size
slider
spark
stacked
steel
tool
warehouse
warehouses
welding
wheel
wit
worker